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Showing content from https://cefsharp.github.io/api/118.6.x/html/T_CefSharp_IExtensionHandler.htm below:

IExtensionHandler Interface Version 118.6.80 Namespace:  CefSharp
Assembly:

CefSharp (in CefSharp.dll) Version: 118.6.80.0 (118.6.80.0)

Syntax 
public interface IExtensionHandler : IDisposable
public interface class IExtensionHandler : IDisposable

The IExtensionHandler type exposes the following members.

Methods   Name Description CanAccessBrowser

Called when the tabId associated with targetBrowser is specified to an extension API call that accepts a tabId parameter (e.g. chrome.tabs.*).

Dispose

Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

(Inherited from IDisposable.) GetActiveBrowser

Called when no tabId is specified to an extension API call that accepts a tabId parameter (e.g. chrome.tabs.*).

GetExtensionResource

Called to retrieve an extension resource that would normally be loaded from disk (e.g. if a file parameter is specified to chrome.tabs.executeScript). Localization substitutions will not be applied to resources handled via this method.

OnBeforeBackgroundBrowser

Called when an extension needs a browser to host a background script specified via the "background" manifest key. The browser will have no visible window and cannot be displayed. To allow creation of the browser optionally modify newBrowser and settings and return false. To cancel creation of the browser (and consequently cancel load of the background script) return true. Successful creation will be indicated by a call to ILifeSpanHandler.OnAfterCreated, and IBrowserHost.IsBackgroundHost will return true for the resulting browser. See https://developer.chrome.com/extensions/event_pages for more information about extension background script usage.

OnBeforeBrowser

Called when an extension API (e.g. chrome.tabs.create) requests creation of a new browser. Successful creation will be indicated by a call to

OnAfterCreated(IWebBrowser, IBrowser)

.

OnExtensionLoaded

Called if the

LoadExtension(String, String, IExtensionHandler)

request succeeds.

OnExtensionLoadFailed

Called if the

LoadExtension(String, String, IExtensionHandler)

request fails.

OnExtensionUnloaded

Called after the IExtension.Unload request has completed.

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